Telephone-transmitter attachment.



PATENTED JUNE 12, 1906.

R. A. WALTON.

TELEPHONE TRANSMITTER ATTACHMENT.

APPLIOATION FILED JULY 251905.

3 zwaw- PArENT OFFICE.

TELEPHGNE THAN$MllTER ATTACHMENT.

Specification of Letters Patent.

Jatentecl June 12, 1906.

Application filed July 25,1905. Serial No. 271,230.

-tion.

it is frequently desired by those using the telephone to converse with others in the office relative to certain matters, and oftentimes it .ried on in the oilice.

is not desired to have the person at the other end of the line overhear the conversation car- Undcr these conditions the person speaking does not desire to return the receiver to the hook, for the reason that the line would then be cut off. In cases where it is found desirable. to close thetransmittcr all that can be done is to hold. the hand over the transmitter-menthpiece, which is not only extremely inconvenient, but oftentimes fails to accomplishthe object.

it is the purpose of this invention to over come these defects and to provide means for sealing the transmitters.

I attain these objects by means of the dcvicc described herein and illustrated in the v accompanying drawings, in which inent applied thereto.

Figure l is a central vertical section. through a. transmitter-mouthpicce, showing mv de-- vice attached thereto. Fig. 2 is a facc view of the transmitter with the mouthpiece re moved therefrom. Fig. 3 is a central vertical section through the transmitter-mouthpiece, showing my modified form of attach- Fig. 4- is a face view of the modified form of the transmitter with the mouthpiece removed therefrom.

Referring now to the drawings, 5 is'the mouthpiece of a telephone-trailsrnitter, having the usual perforated screen 6 in place therein. This mouthpiece is secured in the circular detachable extension-sleeve 7 and consists of two members, the inner member 8 transmit- 10' being being connected to the face of the tor-case 9 and the outer member connected to the mouthpiece 5, both members being held in rotatable engagement with each other a connecting-ring .11. The outer end of t e inner member of this extension-sleeve is threaded externally, as at 12,

and is adapted to be securedin the aperture 13 in the face of the transmitter. On the outer end of the inner member of the extensionsleeve and on its inner perimeter and below the outer end l'have provided a flange 14 to re ceive a perforated disk 15. This disk is preferably made of lead or other analogous mates rial and has allixcd to its outer surface a thin layer of felt 16 or other suitable material and is perforated, as at 17. The outer member is threaded internally,'as at 18, for the reception of the trans]nitter-mouthpiece and is provided with an internal flange 1.), in which a perforated disk 21 is secured, and an external beveled flange 20. This disk is similar to the one in the inner member, and its inner face is covered with felt 22 or other suitable material, and the perforations 23 are adapted to register exactly with the perforations on disk of the inner member. Those two members are held in rotatable engagement with each other by the internally-thrcaded connecting-ring 1], which ring has an internalbcvcled flange 24 on its outer end. ,This beveled connecting-ring is prwsidcd with two stop-pins 25 and 26, which are secured to its outer face and are in the path of a pin 27-, which projects from the side of the outer member of the 'oz' nsioii and limits the movement of the outer member against the inner member.

In Figs. 3 and of the drawings l have illustrated a modified form of my invention in which the circular extension consists of butonc member, which is secured toan aperture in the face of the transmitter-mouthpiece. On the inside'perimeter of the extension is a flange 29, on which is seated a disk similar to that in my preferred construction and having its outer face covered with felt. This disk has a central opening 30, which is adapted to be closed by a movable closure 31. This closure is slightly larger than the opening in the disk and is made of the same material as the disk in the preferred construction and is covered with felt or other suitable material. Attached to this closure is a spring operating-hamlle 32, which projects through a slot 33 in the side of the extension 28.

In operation when it is desired to temporarily suspend the operation of the transmitter-circuit of a telephone the operator simply turns the mouthpiece ofthe telephone until the perforations on the disks are out or registo? with each other, the felt and lead of which the disks are constructed effectually dampening the transmitter and preventing any sound-vibrations entering. I have also found that in constructing the disks of the above-described materials, which have the property of largely absorbing transmitted sound, it as eflectually seals the transmitter 1 In a device of the character herein described, a transmitter-seal composed of an outer and inner member, said outer member secured in movable engagement with the inner member and means secured to both members to seal the transmitter against sound-vibrations.

2. In a device of the character herein de scribed, a transmitter-seal comprising an extension-sleeve mounted between the face of the transmitter and the mouthpiece,said extension-sleeve having means mounted therein to seal the transmitter against sound-vibrations said means comprising a perforated disk secured to said extension-sleeve and adapted to register with like perforations in a disk mounted in the mouthpiece; said mouthpiece in movable engagement with said extension-sleeve and adapted to rotate and close the perforations in the disk mounted in said ext.ens'ionsleeve and seal the transmitter against sound-vibrations.

3. In a device of the character herein described, a transmitterseal, comprising an extension-sleeve composed of an outer and innermember, said inner member secured to the face of the transmitter and ,having a perforated fabric-covered disk secured to its outer' end; said outer member adapted to receive themouthnlece and having a perforated fabric-covered disk, the perforations in said disk 1 egistering with like perforations in the disk 'sa cured 't'o the inner member; means to hold the outer member in movable engagement with the inner memberz;

4. In a device of the character herein-described, a transmitter-seal, co1nprising an extension-sleeve, said sleeve mounted between the face of the transmitter and the mouthpiece; a fabric-covered disk having an aperture therein, movable closure means attached to said eX-tensiomsleeve adaptedtoclose the aperture in said disk and seal the transmitter against sound-vibrations.

In witness that I claim the foregoing I have hereunto subscribed my name this 19th day of July, 1905.

ROBERT A. WALTON.

Witnesses: EDMUND A. STRAUsE, hIARGARETE C. NICKELESON. 

